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  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=s, initial-scale=1.0" />
    <title>Document</title>
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    <script>
      let fruits = ["Apples", "Pear", "Orange"];
      // 在“副本”里 push 了一个新的值
      let shoppingCart = fruits;
      shoppingCart.push("Banana");
      // fruits 里面是什么？
      console.log(fruits.length); // ?
    </script>
  </body>
</html>
